Hi George, The T represents the bit bank which contains 8 pseudo bit-registers like the regular 4 banks of byte registers. It is used by reentrant functions that need bit parameters or local bit variables. There are probably some library functions that use it. As it is a bit bank it cannot be moved out of the bit-addressable area and thus cannot go to address 0x08. Are you sure you need to squeeze out those last few bytes for the stack?
Maarten > Hello all > > I'm building the Contiki OS for cc2430 (8051 with model-large stack-auto). > This is the start of my memory layout after building (rest allocated for > stack). What I am trying to achieve is make more room for the stack, > without using --xstack. Using sdcc 3.0.0 #6037 > > I can easily move the a, b, c Data bytes back to external RAM. However, > what's causing me hassle is the T byte at 0x20. My map file shows BIT_BANK > starting at 0020 with size 1 but nothing listed underneath so I can't > understand what's being put there. I've looked at the various asm files > and I can't find anything. It can't be the bit-addressable SFRs, surely? > sdcc libraries perhaps? > > Is it possible to remove T altogether or perhaps move it to, say, 0x08? > Would this result in the stack starting at a lower address? I've tried > --stack-loc, --data-loc, -Wl -bBSEG but no success. > > Any advice would be appreciated. Thanks a lot > geo > > Internal RAM layout: > 0 1 2 3 4 5 6 7 8 9 A B C D E F > 0x00:|0|0|0|0|0|0|0|0|a|a|a|a|a|a|a|a| > 0x10:|a|a|a|a|b|b|b|b|b|b|b|b|b|c| | | > 0x20:|T|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S| > 0x30:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S| > ------------------------------------------------------------------------------ Achieve Improved Network Security with IP and DNS Reputation. Defend against bad network traffic, including botnets, malware, phishing sites, and compromised hosts - saving your company time, money, and embarrassment. Learn More! http://p.sf.net/sfu/hpdev2dev-nov _______________________________________________ Sdcc-user mailing list Sdcc-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sdcc-user
